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what did u get as ur value for z?http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_s05_qp_6.pdf
Question 6 Part ii .. How do you calculate z over here? I can do the rest easily.. the value of z which is coming for me is the one where they offer 2/3 marks (for answer and method.. but not for the value of z).
what did u get as ur value for z?
its actually phi-inverse of 0.9 not 0.8from table 0.842 for 0.8 probability
then 2(b/0.15)-1 = 0.842
2(b/0.15)=1.842
(b/0.15)=0.921
its actually phi-inverse of 0.9 not 0.8
this is how i did itView attachment 26737
the shaded area is 0.8 so u'll have
2phi(z) - 1 = 0.8
phi(z) = 0.9
so z= phi-inverse 0.9
=1.281 its +/- 1.281
then u can use these values to get b which will also be +/- so that u can find 1.9-b and 1.9+b
hope u got it
ur welcomeah thanks.. I guess I have started showing signs of stats getting way over my head =,= .. And I should try and study something other than stats Hope I don't do these mistakes in the CIE paper!
ok thanxif u see Y can only take the values 0 2 or 4 and since 0 would be when its either 2,2 4,4 or 6,6 u multiply the indiviual probabilities of getting a 2 4 and 6 and add them eg 0.5x0.5 +0.4x0.4+0.1x0.1=0.42
likewise u can solve for 2 and 4 i hope u get what i said
5ai) number has to be 5xxx hence threee places 5 numbers so do 5P3http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_w09_qp_61.pdf Can someone tell me how to do question 5 a please ?
2/3salam...am struckd on one part ov the question...
In a random sample of 1000 body feathers from birds of a certain species, how many would the researcher expect to find with lenghts more than 1 standard deviation from the mean??
5ai) number has to be 5xxx hence threee places 5 numbers so do 5P3
second part daredevil MustafaMotani guys help please
yes but how?6 x 6 x 6 =216
is it correct.. ?
yes but how?
ahhh i see -_-first no. is 5
second third and fourth number has 6 possible numbers
so 6C1 x 6C1 x 6C1
salam...am struckd on one part ov the question...
In a random sample of 1000 body feathers from birds of a certain species, how many would the researcher expect to find with lenghts more than 1 standard deviation from the mean??
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